Measuring approximately 35 metres north to south and 39 metres east to west, it sits quietly in farmland, its perimeter defined by a continuous earthen bank with slight traces of an external fosse, the shallow ditch that would originally have reinforced the bank's defensive or boundary function.

A rath, as this type of monument is commonly known, is an earthen ringfort, the most numerous class of early medieval field monument in Ireland. Most were built and occupied roughly between the sixth and tenth centuries, serving as enclosed farmsteads for single family groups. The bank and fosse combination was less about military defence and more about marking territory, containing livestock, and projecting status. This particular example has three gaps in its circuit, at the northwest, southwest, and east, which may represent original entrances, later breaches, or a combination of both. Notably, it lies just 200 metres north of a separate ringfort, suggesting that this part of Ballynaglea was a settled and organised landscape in the early medieval period rather than an isolated holding. The site was recorded as part of a 1994 archaeological survey of the Ballinrobe district compiled by D. Lavelle, which covered the wider area around Lough Mask and Lough Carra.